Add a search option to the cli

[ibLeDy]

This would add a --search option to the cli, which can be used to search timezones by name.

Examples:

$ timezone-converter --search "new york"
Found 1 timezone: "new_york"

$ timezone-converter --search mad
Found 2 timezones: "madeira", "madrid"

[26tanishabanik]

@ibLeDy I would like to work on this issue, kindly assign this issue to me.

[ibLeDy]

@26tanishabanik So sorry, this issue is already being worked on by @drzcola, but seems like I forgot to assign ¹ it, my bad.

With that said, you're free to take any other issue that is unassigned.

Footnotes

1. Seems like I can't assign him, as he is not a participant of the Issue ↩

[drzcola]

@ibLeDy we have the "--search" as argument. But "-s" is already used for single, so we can either keep it just as "--search" or use another one for the short version of the argument.

[ibLeDy]

I think we can just use --search and -S as a short version